package com.enjoy.studyfragment.widget.contact;

import android.content.Context;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.AppCompatEditText;
import android.util.AttributeSet;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnFocusChangeListener;

import com.enjoy.studyfragment.R;


/**
 * 搜索输入框
 */
public class SearchEditText extends AppCompatEditText implements
        OnFocusChangeListener {

    //清楚输入框图标是否使用 默认不使用
    private boolean isClearIcon = false;
	/**
	 * 删除按钮的引用
	 */
    private Drawable mClearDrawable;

    public SearchEditText(Context context) {
    	this(context, null);
    }

    public SearchEditText(Context context, AttributeSet attrs) {
    	this(context, attrs, android.R.attr.editTextStyle);
    }

    public SearchEditText(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        init();
    }
    
    
    private void init() { 
    	//获取EditText的DrawableRight,假如没有设置我们就使用默认的图片
    	mClearDrawable = getCompoundDrawables()[2]; 
        if (mClearDrawable == null) { 
        	mClearDrawable = getResources() 
                    .getDrawable(R.drawable.edit_clear_image);
        } 
        mClearDrawable.setBounds(0, 0, mClearDrawable.getIntrinsicWidth(), mClearDrawable.getIntrinsicHeight()); 
        setClearIconVisible(false); 
        setOnFocusChangeListener(this);

        //设置左侧图片
        Drawable drawableLeft = getCompoundDrawables()[0];
        drawableLeft.setBounds(0, 0, mClearDrawable.getIntrinsicWidth()/2, mClearDrawable.getIntrinsicHeight()/2);
        setCompoundDrawables(drawableLeft,
                getCompoundDrawables()[1], getCompoundDrawables()[2], getCompoundDrawables()[3]);
    }
 
 
    /**
     * 因为我们不能直接给EditText设置点击事件，所以我们用记住我们按下的位置来模拟点击事件
     * 当我们按下的位置 在  EditText的宽度 - 图标到控件右边的间距 - 图标的宽度  和
     * EditText的宽度 - 图标到控件右边的间距之间我们就算点击了图标，竖直方向没有考虑
     */
    @Override 
    public boolean onTouchEvent(MotionEvent event) { 
        if (getCompoundDrawables()[2] != null) { 
            if (event.getAction() == MotionEvent.ACTION_UP) { 
            	boolean touchable = event.getX() > (getWidth() 
                        - getPaddingRight() - mClearDrawable.getIntrinsicWidth()) 
                        && (event.getX() < ((getWidth() - getPaddingRight())));
                if (touchable) { 
                    this.setText(""); 
                } 
            } 
        } 
 
        return super.onTouchEvent(event); 
    } 
 
    /**
     *当ClearEditText焦点发生变化的时候，判断里面字符串长度设置清除图标的显示与隐藏
     */
    @Override 
    public void onFocusChange(View v, boolean hasFocus) { 
        if (hasFocus) { 
            setClearIconVisible(getText().length() > 0);
            this.setGravity(Gravity.START|Gravity.CENTER_VERTICAL);
        } else { 
            setClearIconVisible(false); 
        } 
    } 
 
 
    /**
     * 设置清除图标的显示与隐藏，调用setCompoundDrawables为EditText绘制上去
     * @param visible
     */
    protected void setClearIconVisible(boolean visible) {
        if(!isClearIcon){
            return;
        }
        Drawable right = visible ? mClearDrawable : null;
        setCompoundDrawables(getCompoundDrawables()[0],
                getCompoundDrawables()[1], right, getCompoundDrawables()[3]);
    }

}
